两个时间间隔之间的差异ios组件swift 3答案

【问题标题】：difference between two time interval ios components swift 3两个时间间隔之间的差异ios组件swift 3
【发布时间】：2016-10-29 11:15:05
【问题描述】：

我有两个时间间隔，基本上我想转换找出它们之间的区别这是我的代码。但是，它不起作用

 func dateformatter(date:Double) -> String {

    let timeElapsed:TimeInterval = TimeInterval(Int(date))
    let timeNow:TimeInterval = TimeInterval(integerLiteral: Int64(Date().timeIntervalSince1970*1000))

    let date2:Date = Date(timeIntervalSince1970: timeElapsed )
    let date1:Date = Date(timeIntervalSince1970: timeNow )

    let calender:Calendar = Calendar.current
    let components:DateComponents = calender.dateComponents([.year, .month, .day, .hour, .minute], from: date1, to: date2)
    var returnString:String = ""
    print(components.second)
    if components.second! < 60 {
        returnString = "Just Now"
    }else if components.minute! >= 1{
        returnString = String(describing: components.minute) + " min ago"
    }else if components.hour! >= 1{
        returnString = String(describing: components.hour) + " hour ago"
    }else if components.day! >= 1{
        returnString = String(describing: components.day) + " days ago"
    }else if components.month! >= 1{
        returnString = String(describing: components.month)+" month ago"
    }else if components.year! >= 1 {
        returnString = String(describing: components.year)+" year ago"
    }
    return returnString
}

【问题讨论】：

组件调用时返回 nil
timeElapsed 和timeNow 参数从何而来？
@dirtydanee 我更新看看
您能否具体说明it is not works 是什么意思？您收到什么错误？
初始化DateComponents实例时需要包含.second组件：let components: DateComponents = calender.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date1, to: date2)。除此之外，请阅读可选选项和打开这些选项的安全方法（... myOptional! 不安全！）。

标签： ios date swift3 nstimeinterval

【解决方案1】：

无需在函数开始时进行所有转换。 Date(timeIntervalSince1970:) 接受 NSTimeInterval，但是，它只是 double 的 typealias。

另外，因为您的第一个 if 语句检查 seconds，您需要将 .seconds 包含到组件参数列表中。

您可以执行以下操作：

func dateformatter(date: Double) -> String {

    let date1:Date = Date() // Same you did before with timeNow variable
    let date2: Date = Date(timeIntervalSince1970: date)

    let calender:Calendar = Calendar.current
    let components: DateComponents = calender.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date1, to: date2)
    print(components)
    var returnString:String = ""
    print(components.second)
    if components.second! < 60 {
        returnString = "Just Now"
    }else if components.minute! >= 1{
        returnString = String(describing: components.minute) + " min ago"
    }else if components.hour! >= 1{
        returnString = String(describing: components.hour) + " hour ago"
    }else if components.day! >= 1{
        returnString = String(describing: components.day) + " days ago"
    }else if components.month! >= 1{
        returnString = String(describing: components.month)+" month ago"
    }else if components.year! >= 1 {
        returnString = String(describing: components.year)+" year ago"
    }
    return returnString
}

【讨论】：

【解决方案2】：

只是提示，您的逻辑中存在错误，导致函数在每种情况下都返回“Just now”。所以这里是修改后的代码：

func timeElapsed(date: Date) -> String {

        let date1:Date = date
        let date2: Date = Date() // Same you did before with timeNow variable

        let calender:Calendar = Calendar.current
        let components: DateComponents = calender.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date1, to: date2)
        print(components)
        var returnString:String = ""

        print(components.second!)

        if components.second! < 60 {
            returnString = "Just Now"
        }

        if components.minute! > 1{
            returnString = String(describing: components.minute!) + " mins ago"
        }
        else if components.minute! == 1 {

            returnString = "A minute ago"
        }

        if components.hour! > 1{
            returnString = String(describing: components.hour!) + " hours ago"
        }
        else if components.hour == 1 {

            returnString = "An hour ago"
        }

        if components.day! > 1{
            returnString = String(describing: components.day!) + " days ago"
        }
        else if components.day! == 1 {

            returnString = "Yesterday"
        }

        if components.month! > 1{
            returnString = String(describing: components.month!)+" months ago"
        }
        else if components.month! == 1 {

            returnString = "A month ago"
        }

        if components.year! > 1 {
            returnString = String(describing: components.year!)+" years ago"
        }
        else if components.year! == 1 {

            returnString = "A year ago"
        }

        return returnString
    }

【讨论】：